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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Accounting Policies [Line Items]                        
Derivative Liability, Fair Value, Gross Liability $ (45.4)       $ (5.6)         $ (45.4) $ (5.6)  
Advertising costs of Company-operated restaurants                   532.9 645.8 $ 718.7
Other marketing-related expenses                   100.2 88.8 113.8
Unrecognized compensation cost related to nonvested share-based compensation that is expected to be recognized 106.0                 $ 106.0    
Weighted-average expected recognition period for unrecognized share-based compensation costs                   2 years    
Long lived assets impairment test period                   12 months    
GoodiwillWrittenOffRelatedToSaleOfCompanyRestaurantMonthsFromAcquisition                   24 months    
Fair Value Goodwill Written Off Related To Sale Of Restaurant Minimum Months Company Operated                   24 months    
Goodwill, Impaired, Accumulated Impairment Loss 14.5       96.6         $ 14.5 96.6  
Debt obligations, carrying amount 29,500.0                 29,500.0    
Net increase (decrease) after-tax related to the cash flow hedges component of accumulate OCI in shareholders' equity                   (39.4) $ 2.9 $ (11.0)
Cumulative deferred hedging losses, after tax, included in accumulated other comprehensive income 16.5                 $ 16.5    
Dilutive effect of share-based compensation                   8.1 6.8 5.2
Stock options that were not included in diluted weighted-average shares                   0.1 1.2 1.0
Assets of businesses held for sale 0.0       1,527.0         $ 0.0 $ 1,527.0  
Revenues from franchised restaurants 2,667.1 $ 2,690.3 $ 2,480.1 $ 2,264.0 2,376.1 $ 2,452.0 $ 2,348.4 $ 2,150.4   10,101.5 9,326.9 $ 8,924.7
Level 2                        
Significant Accounting Policies [Line Items]                        
Debt obligations, fair value 31,800.0                 31,800.0    
Interest Rate Swap [Member]                        
Significant Accounting Policies [Line Items]                        
Derivative, Notional Amount 1,800.0                 $ 1,800.0    
Building [Member]                        
Significant Accounting Policies [Line Items]                        
Property and equipment, estimated useful life maximum                   40 years    
Leasehold Improvements [Member]                        
Significant Accounting Policies [Line Items]                        
Property and equipment, estimated useful life                   the lesser of useful lives of assets or lease terms    
Minimum | Equipment [Member]                        
Significant Accounting Policies [Line Items]                        
Property and equipment, estimated useful life maximum                   3 years    
Maximum | Equipment [Member]                        
Significant Accounting Policies [Line Items]                        
Property and equipment, estimated useful life maximum                   12 years    
Intercompany Debt [Member]                        
Significant Accounting Policies [Line Items]                        
Notional Amount of Nonderivative Instruments                   $ 3,600.0    
Debt [Member]                        
Significant Accounting Policies [Line Items]                        
Notional Amount of Nonderivative Instruments                   11,900.0    
ERROR in label resolution.                        
Significant Accounting Policies [Line Items]                        
Derivative, Notional Amount 761.7                 $ 761.7    
Period covered by hedge                   18 months    
Not Designated as Hedging Instrument [Member]                        
Significant Accounting Policies [Line Items]                        
Derivative Liability, Fair Value, Gross Liability (6.8)       (1.9)         $ (6.8) (1.9)  
Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member] | Equity                        
Significant Accounting Policies [Line Items]                        
Derivative Liability, Fair Value, Gross Liability (6.8)       $ (1.9)         (6.8) $ (1.9)  
Accounting Standards Update 2014-09                        
Significant Accounting Policies [Line Items]                        
Franchise fees expected cumulative catch-up adjustment, deferred revenue 600.0                 600.0    
Franchise fees expected cumulative catch-up adjustment, deferred tax asset $ 150.0                 $ 150.0    
Scenario, Forecast [Member] | Accounting Standards Update 2014-09                        
Significant Accounting Policies [Line Items]                        
Revenues from franchised restaurants                 $ 50.0